countUntil with negated pre-defined predicate?

[Robert M. Münch via Digitalmars-d-learn]

This works:

        countUntil!(std.uni.isWhite)("hello world"))

How can I switch this to (not working);

        countUntil!(!std.uni.isWhite)("hello world"))

without having to write my own predicate?

Or is there an even better way to search for all "drawable unicode characters"?

--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster